Maymom inserts to reduce Freemie 25 mm cups down to 21 mm
Made from BPA free silicone
2 pc per package
Suitable for nipple diameter (after a pumping session) 18-20 mm
You must "fold" the insert to install, and "twist and turn" to remove the insert. If you don't do so, it is hard to install and remove. See instructions that come with the product.